8ball: fix substring pronoun bug, switch to 3B model

- Fix about_jared/about_wynter using substring match — "they" matched
  "he", "theme" matched "he", etc., routing Wynter's questions to the
  wrong branch. Now uses \b word boundaries via re.search.
- Switch BALL_MODEL default from sadiq-bd 1B uncensored to
  llama3.2:latest (3B) — the 1B model hallucinates, ignores persona
  instructions, and mentions Jared randomly. GPU is now working on
  Arc A380 at ~25 tok/s so the larger model is practical.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

matrixbot/config.py

@@ -19,7 +19,7 @@ LOG_LEVEL = os.getenv("LOG_LEVEL", "INFO")
 # Integrations
 OLLAMA_URL = os.getenv("OLLAMA_URL", "http://10.10.10.157:11434")
 OLLAMA_MODEL = os.getenv("OLLAMA_MODEL", "llama3.2:latest")
-BALL_MODEL = os.getenv("BALL_MODEL", "sadiq-bd/llama3.2-1b-uncensored:latest")
+BALL_MODEL = os.getenv("BALL_MODEL", "llama3.2:latest")
 ASK_MODEL = os.getenv("ASK_MODEL", "llama3.2:latest")
 MINECRAFT_RCON_HOST = os.getenv("MINECRAFT_RCON_HOST", "10.10.10.67")
 MINECRAFT_RCON_PORT = int(os.getenv("MINECRAFT_RCON_PORT", "25575"))